In just over a year, British oral care brand Ordo has gone from zero to 20,000 stores across America, landing in Walmart, Target, and CVS with a Squishmallows-licensed kids toothbrush that now commands up to 50% of the category in some retailers. Co-founder Barty Walsh speaks to Retail Week about cracking the US market, taking on legacy brands and building a profitable business without venture capital.